Methods: Review the data of 24 hours dynamic electrocardiogram (DCG) in 1 056 elderly patients.

方法：回顾性分析1 056例老年患者24小时动态心电图（DCG）的资料。

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Objective To evaluate the characteristics of dynamic electrocardiogram (DCG) in the preterm infants.

目的探讨早产儿动态心电图(DCG)特点。

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Method Dynamic electrocardiogram (DCG, CM 1 and CM 5 bipolar leads) were recorded in 13 pilots before, during and after parabolic flights.

方法记录1 3名被试者在失重飞机飞行前、中、后的动态心电图（DCG）。

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